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     图片标签src链接到图片地址 alt图片加载失败的文字说明 -->
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      controls 控制条
      w  h  宽高
      autoplay 自动播放
      loop 循环播放
      muted 静音播放
      poster 封面
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      <video loop  width="300" controls  src="./音视频/1.mp4"></video>
      <!-- 音频标签
       controls 控制条
       autoplay 自动播放
       loop 循环播放
       muted 静音播放
       -->
       <audio controls src="./音视频/1.mp3"></audio>
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